I've used their case on my iPhone 3Gs, and bought one of these for my 4Gs (for $20 at my cell phone accessory booth in my local shopping mall).

The 3Gs case covered the front corners, but their iPhone 4 case leaves the corners too exposed, imho.
I've dropped my 3Gs a few times in the two years that I had it, and the Pure Gear case definetly saved it from damage.
The corners of the case showed visible scratches and nicks that would have been on my phone otherwise.

That same protection is not on the Pure Gear case for the iPhone 4, however.
The corners seemed much more exposed than on their previous cases.

I am a fan of holsters, and Pure Gear's holsters on this and their previous models are very good.
Not only are they sturdy, but they are balance... meaning that the clip attaches to the holster at the exact middle of the case. This means that when the phone and holster are in the horizontal position it hangs evenly horizontally with even weight on both sides of the clip.

The currect holster that I am using has the clip situated a little more towards the top.
This means it hangs lower when in a vertical position, it is bottom-heavy when in a horizontal position, making it droop down when loosely clipped to something.

I definitly like the Pure Gear design and construction of the holster, but I wish the case itself offered more protection around the front corners of the device.

I have one of these I got at the Verizon Store for my 4 about a year and a half ago. I use it on my 4S now. It has a different pattern on the back, but same exact design. Works really well. I saw one on a friends droid and thought it looked like it worked pretty good. If I remember correctly, I paid about $29 for it.